This seems decent for £280 from a respected buyer on ebay, comes with case and 3 year warranty:
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item...
HP 625 Laptop Computer
AMD Athlon II Dual-Core (P360) 2.3GHz Processor with 1MB L2 Cache
320GB (5400rpm) SATA II Hard Drive
3GB (1333MHz) DDR3 SDRAM
2MP Webcam with in built Mic
DVD±RW SuperMulti Dual Layer with LightScribe
15.6 inch LED-Backlit HD Anti-Glare Display
ATI Mobility Radeon HD 4200 Graphics
Latest Wireless 802.11N and Bluetooth 3.0
Microsoft Windows 7 Home Premium (64-bit)
HDMI, Card Reader, 3x USB, VGA
Full 3 Year HP Warranty (1Year Standard + 2 Year additional included)